Github user bbende commented on the issue:
https://github.com/apache/nifi-registry/pull/64
+1 Ran through a full test with NiFi & Registry both configured with a
composite user-group-provider, and put an LDAP user into a file-based group,
and then made a bucket and gave the group access to that bucket, verified the
LDAP user could use that bucket from NiFi... nice work---
